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This International Standard describes a number of methods that are applicable to the measurement of the thickness of coatings applied to a substrate. Methods for determining wet-film thickness, dry-film thickness and the film thickness of uncured powder layers are described. Reference is made to individual standards where these exist. Otherwise the method is described in detail. An overview on the methods is given in Annex A, in which the field of application, existing standards and the precision are specified for the individual methods. This International Standard also defines terms concerning the determination of film thickness.